I just bought a used G2 also. It has the old 15 pin game port, a Radio Shack USB/gameport converter, and the Interlink Controller.

First thing to do is upgrade to the last G2 version - .723. You need the original CD serial number and for the seller to call Real Flight to clear that serial number. Then you can register yours and get the update free. After I did that, the sim loaded up just fine.

If you already have the last version and it still does not work, let me know. There may be something else I did that might help.

My computer does not even have a gameport, but the USB converter works just fine.

Brian